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RESEARCH PAPERS: Heat Transfer Enhancement

Thermal and Hydraulic Performance of a Rectangular Duct With Multiple V-Shaped Ribs

[+] Author and Article Information
C.-O. Olsson

Department of Thermo and Fluid Dynamics, Chalmers University of Technology, 412 96 Goteborg, Sweden

B. Sunden

Division of Heat Transfer, Lund Institute of Technology, Box 118, 221 00 Lund, Sweden

J. Heat Transfer 120(4), 1072-1077 (Nov 01, 1998) (6 pages) doi:10.1115/1.2825892 History: Received September 25, 1996; Revised June 01, 1998; Online December 05, 2007

Abstract

Experiments have been carried out to investigate the performance of a new swirl flow duct which is suitable for compact heat exchangers such as radiators. The ducts tested have rectangular cross sections with aspect ratio 1 to 8, and multiple V-shaped ribs are attached to the wide walls in a staggered arrangement such that square secondary flow cells are established. A previous investigation has shown that multiple V-shaped ribs may provide greater heat transfer enhancement than angled straight ribs and V-shaped ribs at Reynolds numbers below 2000. The data are presented as j and f factors for Reynolds numbers from 500 to 15,000, and correlations are obtained for the influence of rib height (0.1 < e/H < 0.2), rib pitch (3 < p/H < 7), and rib angle (15 deg < Φ < 45 deg). It was found that a rib angle of 45 deg provided the highest j/f ratio, while increasing the rib height or decreasing the rib pitch lowers the j/f ratio.

Copyright © 1998 by The American Society of Mechanical Engineers
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